The headline-molecule habit
Mitochondrial biology is unusually prone to single-molecule storytelling. One compound is presented as the mitochondrial ingredient, and everything else in the organelle becomes background. The organelle does not work that way.
Mitochondrial function depends on at least four things running simultaneously: substrate supply, an intact electron-transport chain, the cofactors those enzymes require, and quality control processes that remove and replace damaged components.
Electron transfer is a chain, not a step
Reducing equivalents generated in metabolism are passed through a sequence of complexes; the resulting proton gradient drives ATP synthesis. A carrier that shuttles electrons between complexes matters — but so does the availability of the enzymatic machinery on either side of it.
Supporting one link while ignoring the others is a plausible-sounding intervention with an implausible model of the system.
Cofactors are not filler
Several B-group vitamins and trace elements function as cofactors within energy metabolism, and their physiological roles in normal energy-yielding metabolism are established in European regulatory terms. They are unglamorous, which is precisely why they are often reduced to a token presence.
In an architecture built from biology forwards, the cofactor layer sits beneath the others: it is not what makes a formulation interesting, it is what makes the rest of it coherent.
NAD⁺ metabolism as context, not conclusion
NAD⁺ is central to energy transfer and to several regulatory enzyme families, and its metabolism is a legitimate architectural position. Human research on precursor supplementation consistently reports increases in blood NAD⁺-related metabolites; the translation of those increases into functional outcomes in healthy people is far less settled.
The honest formulation is therefore: mechanistically well-supported, biomarker-responsive, functionally unresolved. That sentence rarely survives contact with marketing.
What follows for design
If mitochondrial function is a network, a formulation addressing it should be a network too — several defined positions, each justified separately, none carrying the whole story.
And the same rule applies at the end as at the beginning: evidence for the individual positions is not evidence for the finished product. Product-specific conclusions require the complete final formulation to be studied in appropriately designed human research.